| 摘要 |
PURPOSE:To shorten a time for assembly while being small-sized and having a small amount of use of a cooling medium by providing gaps between turns of a disc-shaped unit windings and providing plates of an insulating substance having a large number of small holes between neighboring unit windings. CONSTITUTION:When a winding 2 is made conductive by operating a superconductive stationary induction apparatus, the winding 2 is slightly heated. A cooling medium flows inside the gaps 9 between the turns of a unit winding 21 as shown by the flow 8 so that the winding 2 is cooled to hold a superconductive state. At a plate 10 of an insulating substance, the cooling medium flows inside a small hole 12. Since a large number of small holes 12 are provided, the flow 9 of the cooling medium inside the gaps 9 does not come to an end. Liquid helium is used at about 4K, and kinetic viscosity at that time is 0.025centistokes, while liquid nitrogen is used at about 77K and the kinetic viscosity at that time is 0.18centistokes, so in each case the viscosity is extremely small so as to easy to flow even in a narrow spot, and moreover, the winding 2 is slightly heated so that it can be sufficiently cooled by the cooling medium passing through the small hole 12. Similarly with the gaps 9, and moreover, the surface area to be cooled of the winding 2 increases so that it can be sufficiently cooled even it is narrow. |
